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Brazilian Wandering Spiders

Here's some photos of Wandering spiders. Many thanks for allowing us to use the photos sent in. All photos are copyright to their owners and may not be reproduced without permission. Please choose a section.

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WANDERING SPIDERS  - Phoneutria sp

The Brazilian Wandering spider (Phoneutria fera)  is regarded by some as the most dangerous spider in the world. Aggressive and highly venomous, it kills some 5 people across the world annually.  It is named as such because it was first discovered in Brazil, though this genus is known to exist elsewhere in South and Central America. This spider is a member of the Ctenidae family of wandering spiders. The family of Ctenidae, where both genera, Cupiennius and Phoneutria, belong to has to date more than 500 valid, described species. Most of them have no common names. Phoneutria spp. is actually a genus with five known similar species whose members are highly venomous and not reluctant to attack people who appear threatening. However, recent studies possibly indicate (but not with any irrefutable proof) that these spiders only inject venom in approximately one-third of their bites and may only inject a small amount in another third. Bites from these spiders may result in only a couple of painful pinpricks, or may involve full-blown envenomation; but in all cases, people bitten by a Phoneutria, or any Ctenid, should seek immediate emergency treatment, as the venom can be life threatening. P. fera and P. nigriventer are the two most commonly implicated as the most virulent of the Phoneutria spiders. P. nigriventer venom contains a potent neurotoxin, also known as PhTx3, which acts as a broad-spectrum calcium channel blocker that inhibits glutamate release, calcium uptake and also glutamate uptake in neural synapse. At deadly concentrations, this neurotoxin causes loss of muscle control, and breathing problems, resulting in paralysis and eventual asphyxiation. In addition, the venom causes intense pain and inflammation following an attack due to an excitatory effect the venom has on the serotonin 5-HT4 receptors of sensory nerves. This sensory nerve stimulation causes a release of neuropeptides such as substance P which triggers inflammation and pain.  Aside from causing intense pain, the venom of the spider can also cause priapism - uncomfortable erections that can last for many hours and lead to impotence. The venom may eventually be used in erectile dysfunction treatments.

The Brazilian Wandering spider is reputed to occasionally hide in clusters of bananas. As a result, any large spider appearing in a bunch of bananas should be treated with due care. This spider is called the wandering spider because it wanders the jungle floor, rather than residing in a lair or maintaining a web. This attribute is another reason it is considered so dangerous. In densely populated areas, Phoneutria species usually search for cover and dark places to hide during daytime, and this may occur inside houses, clothes, cars, boots, boxes and log piles; thus generating accidents when near people.  Information - Answers.com & Wikipedia

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9 March, 2008:
Unique wandering spider I know is phoneutria nigriventer (mine) because phoneutria fera lives at amazon jungle, too far from my state, and others species lives in other countries such Bolivia and places at Central America. This spider is not extremely rare, but it's not easy to find. There are videos at youtube about this spider, here one very interesting, this show the 'attack pose' (we call this spider as 'armadeira') I don't do this on mine, because I don't like to injury this animal. http://www.youtube.com/watch?v=pfm9OFX_Q2M See ya.  

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Photos provided by Stefan Hillebrecht  Click for a larger view

Two pictures of my dead P. reidyi wild-caught female (originated from Peruvian Amazon area). The spider has a leg span of more than 15cm (6") and a body length of close to 5cm (2").

Phoneutria boliviensis-adult female & young

Phoneutria boliviensis-adult female

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Phoneutria Nigriventer - female - Sao Paolo

Phoneutria Nigriventer - female

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Phoneutria Nigriventer - female

Phoneutria Reidyi - female & egg sac

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